Question: An engine is used on a job requiring (110 mathrm{~kW}) BP. The mechanical efficiency of the engine is (80 %) and engine consumes (50 mathrm{~kg}

An engine is used on a job requiring $110 \mathrm{~kW}$ BP. The mechanical efficiency of the engine is $80 \%$ and engine consumes $50 \mathrm{~kg} / \mathrm{hr}$ of fuel. A design improvement is made which reduces the engine friction by $5 \mathrm{~kW}$. If indicated thermal efficiency remains the same, how many $\mathrm{kg}$ of fuel per hour will be saved?

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